[It made me so happy every time someone mistakenly took my older brother to be my boyfriend------]

The story of a flippant playboy older brother who actually only has eyes for his little sister,
and that very sister who loves him despite his faults.

The two are already in a relationship, and this manga features their flirty lovey sexy days together.
May not be suitable for those that seek to enjoy feelings of immorality derived by inc*stuous relationships.
(The relationship is actually rather sweet and sincere, and both parties are mature.)